摘要：

1,4-Dienes, vinyl ethers, allyl ethers, allyl thioethers and propene-thiolates are efficiently metalated by butyllithium in the presence of an activator such as potassium t-butoxide. Since the solvent, the counter-ion or the temperature may be varied before subsequent treatment with an electrophilic reagent, the critical ratio of direct vs. vinylogous attack (substitution at the α- or γ-position, respectively) can usually be adjusted within large limits. In many cases stereo-selectivity is achieved as well.

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